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Physiological and Biochemical Zoology 85, 5 (2012) 533-542
Body Girth as an Alternative to Body Mass for Establishing Condition Indexes in Field Studies: A Validation in the King Penguin.
Vincent A Viblanc 1, 2, Pierre Bize 1, François Criscuolo 2, Maryline Le Vaillant 2, Claire Saraux 2, 3, Sylvia Pardonnet 2, Benoit Gineste 2, Marion Kauffmann 2, Onésime Prud'Homme 2, Yves Handrich 2, Sylvie Massemin 2, René Groscolas 2, Jean-Patrice Robin 2
(09/2012)

Abstract Body mass and body condition are often tightly linked to animal health and fitness in the wild and thus are key measures for ecophysiologists and behavioral ecologists. In some animals, such as large seabird species, obtaining indexes of structural size is relatively easy, whereas measuring body mass under specific field circumstances may be more of a challenge. Here, we suggest an alternative, easily measurable, and reliable surrogate of body mass in field studies, that is, body girth. Using 234 free-living king penguins (Aptenodytes patagonicus) at various stages of molt and breeding, we measured body girth under the flippers, body mass, and bill and flipper length. We found that body girth was strongly and positively related to body mass in both molting ([Formula: see text]) and breeding ([Formula: see text]) birds, with the mean error around our predictions being 6.4%. Body girth appeared to be a reliable proxy measure of body mass because the relationship did not vary according to year and experimenter, bird sex, or stage within breeding groups. Body girth was, however, a weak proxy of body mass in birds at the end of molt, probably because most of those birds had reached a critical depletion of energy stores. Body condition indexes established from ordinary least squares regressions of either body girth or body mass on structural size were highly correlated ([Formula: see text]), suggesting that body girth was as good as body mass in establishing body condition indexes in king penguins. Body girth may prove a useful proxy to body mass for estimating body condition in field investigations and could likely provide similar information in other penguins and large animals that may be complicated to weigh in the wild.
1 :  Department of Ecology and Evolution
Université de Lausanne
2 :  Département Ecologie, Physiologie et Ethologie (DEPE-IPHC)
CNRS : UMR7178 – Université de Strasbourg
3 :  Laboratoire Ressources Halieutiques de Sète
Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
Sciences de l'environnement

Sciences du Vivant/Biodiversité/Evolution

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